/Engine/Source/Editor/UnrealEd/Classes/Factories/PhysicalMaterialMaskFactory.h
class UPhysicalMaterialMaskFactory : public [UFactory](API\Editor\UnrealEd\Factories\UFactory), public [FReimportHandler](API\Editor\UnrealEd\FReimportHandler)
TSubclassOf<UP...
PhysicalMaterialMaskClass